These resources are useful places to research causes, symptoms and treatments for asthma and other breathing problems.

Centers for Disease Control & Prevention

National Institute of Environmental Health Sciences

American Academy of Allergy, Asthma and Immunology

Allergy & Asthma Foundation of America

Understanding Asthma

American Lung Association

The American Institute for Aromatherapy and Herbal Studies

Journal of the Canadian Pediatric Society

Positive Health

The Utah Department of Health

Clean Air Council

National Society for Clean Air & Environmental Protection

Clean Air Trust